For the PC and IPad without a GPS receiver (Only the GSM version has a GPS receiver) you will need to buy a GPS receiver, For PC you can buy a cheaper USB dongle, but for the IPad, you have to buy a Bluetooth GPS dongle, make sure that it is Apple compatible .

Galileo

Available on the Apple Apps store , Galileo is an IOS IPad app is currently costs €3.99 for the pro version to enable all functionality.

Locus

Is an Android tablet app and can be found on the google play store if you don’t mind the adverts you don’t have to purchase the license but there is additional useful functionality available in the pro version.

Cartograph

Available on the Apple apps store and Google Store, this app is still in early days of development but allows greater control over the displayed size of the charts which is useful on low resolution devices – available for IOS and Android